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On the cardinality of sumsets in torsion-free groups
cardinality of sumsets torsion-free groups
2010/12/15
Let A,B be finite subsets of a torsion-free group G. We prove that for every positive integer k there is a c(k) such that if |B| ≥ c(k) then the inequality |AB| ≥ |A| + |B| + k holds unless a left tra...